eKuiper 1.4.0-beta.1 release

Introduction

As a big milestone, eKuiper v1.4.0 will bring many exciting features into the product. User can start to try some of these features in eKuiper 1.4.0-beta.1. We introduce portable plugin system to ease the development. build and deployment of plugin in addition to the native go plugin. Users can now use go and python to compose a plugin and the system can be easily extended to more language support. We enable the built-in support of flexible rule pipeline by memory source and sink. Additionally, we extract a standalone connection layer（mqtt and edgex now) so that the source, sink or user's plugin can share a connection instance to avoid connection overhead.

Features

• KV storage implementation is now configurable. Provide redis as an alternative KV storage option in addition to default sqlite, please check the doc for how to configure the storage.
• eKuiper configuration can be overwritten via environment variables, please check the doc for more info.
• Add portable plugin support, user can develop plugins in multiple languages
  • portable plugin intrduction
  • go sdk
  • python sdk
  • plugin develop help tool
• Support source/sink to share connections for mqtt or edgex, please check this for more info
• Add memory source and sink, please check this for more info

Fixes

• Mqtt source should stop executing after errors
• Update tdengine client version to 2.2.0.5

Docs

• Rule pipeline
• Portable Plugin
• Fix the typo in plugin management rest api
• Add connectionSelector property for mqtt/edgex source/sink

Thanks

• @rwadowski provides redis kv storage
• @rwadowski provides memory source/sink type
• @rwadowski provides config eKuiper by env variables